| 摘要 |
The digital multi interphone system comprises a plurality of terminal interphones connected in parallel to a sub speech line and to a sub control line, for controlling the line connection to the sub speech line; at least more than one sub controller connected in parallel to a main speech line and to a main control line, for receiving/transmitting a control command from/to the terminal interphones via the sub control line and controlling the line connection between the main speech line and the sub speech line; and a master interphone for receiving/transmitting a control command from/to the sub controller via the main control line in a digital communication mode, controlling the line connection to the main control line and controlling the exchange connection of a speech line between the terminal interphones according to the exchange information.
|
